[V8] HVAC system output goes to defrost and floor upon acceleration

[Scott Simmons]

I'm pretty sure it has to deal with a drop in manifold vacuum and thus 
the loss of pressure to vacuum-operated devices.  I think I've had 
non-Deutsch cars do this too.

~Scott S.

Ed Kellock wrote:

>I've seen it many times before but I've forgotten the cause and can't
>seem to find it in the archives.
>
>When I open the throttle to accelerate or hold speed going up a hill,
>the blower output goes to the floor and the windshield.  This is
>happening on both my Avant and my 93 V8.
>
>Is this as simple as a vacuum leak somewhere?
>
>On the Avant, I checked the black supply line from the engine and it
>is still connected in the engine compartment and in the plenum are at
>the base of the windshield.
>
>What else should I look for?
>
>Thanks,
>Ed
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